292 * Scientific Intelligence. 



above had drifted out to sea from other districts and bear in the 

 character of their structures the impress of the different type of 

 land on which they lived " (pp. 210, 212). c. s. 



9. The early Paleozoic Bryozoa of the Baltic Provinces y by 

 Ray S. Bassler. U. S. Nat. Mus.,' Bull. 77, 1911, pp. 382, pis. 

 13 and 226 text illustrations. — This important work on the Ordo- 

 vician Bryozoa of Esthonia and Sweden describes in detail 161 

 forms, and of these 69 are either new species or new varieties. 

 All of these fossils are also carefully located in the geologic hori- 

 zons, and as so many species are common to Europe and North 

 America, this evidence furnishes the author with excellent faunal 

 criteria for exact intercontinental stratigraphic correlation. On 

 an average about 35 per cent (or a total of 65 out of 161) of the 

 species are common to the Baltic area and America. On the basis 

 of this evidence the author has the decided advantage of all pre- 

 vious stratigraphers and he makes out a good case, proving his 

 detailed correlations, and also that the Ordovician sequence of 

 Esthonia when compared with that of the interior of America is 

 very incomplete. His main conclusion is " that the greater part of 

 the Russian Ordovician section may be directly correlated with 

 the Black River group of America, while the tipper Lyckholm 

 and Borkholm limestones are the equivalents of the Richmond 

 group " (2). 



The author then takes up a short study of the Arctic American 

 Ordovician faunas and finds "that the geologic section at Baffin 

 Land consists of Black River strata resting upon the old crystal- 

 line rocks, followed by an early Trenton formation equal to the 

 Stewartville and Prosser limestones of Minnesota, and this in turn 

 succeeded [apparently] unconformably by the widespread coral 

 zone of the Richmond group " (36). He has plotted on a paleo- 

 geographic map (43) all the known Arctic occurrences of Black 

 River and early Trenton deposits, and brings out very clearly the 

 striking new knowledge that the faunas entombed in these rocks 

 are from the Arctic ocean and that its waters and life have spread 

 at times during the Ordovician southward into northern Europe 

 and into America as far as Tennessee. This distribution is now 

 established and is further borne out by the similar spread of the 

 Silurian faunas Avhich Weller published many years ago showing 

 that they too are also largely of Arctic and North European 

 origin. c. s. 



10. A description of the fossil fish remains of the Cretaceous, 

 Eocene, and Miocene formations of New Jersey ; by Henry W. 

 Fowler. Geol. Surv. N. J., Bulletin 4, 1911, pp. 192, with 108 

 text figures. — This work is a descriptive and fully illustrated sum- 

 mary of the fish remains, essentially sharks and chimseras, found 

 in the late Mesozoic and Tertiary deposits of New Jersey. Of 

 species there are over 90 (sharks 43, chimaeras 21, true fishes 24, 

 uncertain 3), and of these but 4 are new forms. c. s. 



11. Types of Ore Deposits ; edited by H. Foster Bain. Pp. 

 378, with 345 figures. San Francisco, 1911 (Mining and Scientific 



